Composite coating fresh keeping agent containing hawthorn leaf flavone and preparation method and application thereof
A hawthorn leaf flavonoid and compound fresh-keeping technology, which is applied in the application, food preservation, food science and other directions, can solve the problems of lack of anti-oxidation and inhibition of microbial activities and other multi-functional comprehensive fresh-keeping effects, large chemical fresh-keeping residues, and safety doubts. , to achieve the effect of improving synergistic antioxidant and bacteriostatic activities, obvious fresh-keeping effect, and enhancing integrity
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Embodiment 1
[0029] An extraction of hawthorn leaf flavonoids is characterized in that the following method is used to extract:
[0030] (1) Mix the powder of hawthorn leaves with 70vol% ethanol solution according to the ratio of material to liquid: 1g: 20mL, then add acetic acid to adjust the pH value to 4, stir evenly, add to the ultrasonic extractor, and heat up to 3°C / min. 50°C, under the condition of power of 500W, repeat the extraction three times, each time for 20min;
[0031] (2) Combine the extracts and filter, and when the filtrate is extracted with ethyl acetate until it becomes nearly transparent, remove the ethyl acetate layer with a separatory funnel, concentrate in a rotary evaporator, and freeze-dry to obtain hawthorn leaf flavonoids.
[0032] A compound preservative containing hawthorn leaf flavonoids extract, raw materials are:
[0033] Hawthorn leaf flavonoid extract 0.5 parts, carboxymethyl chitosan 30 parts, glycerin 30 parts, calcium chloride 5 parts, polyethylene gl...
Embodiment 2
[0040] A hawthorn leaf flavone is characterized in that it is extracted by the following method:
[0041] (1) Mix the powder of hawthorn leaves with 70vol% ethanol solution according to the ratio of material to liquid: 1g: 20mL, then add acetic acid to adjust the pH value to 4.5, stir well, add it to an ultrasonic extractor, and heat up to 4°C / min. 50°C, under the condition of power of 500W, repeat the extraction three times, each time for 20min;
[0042] (2) Combine the extracts and filter, and when the filtrate is extracted with ethyl acetate until it becomes nearly transparent, remove the ethyl acetate layer with a separatory funnel, concentrate in a rotary evaporator, and freeze-dry to obtain hawthorn leaf flavonoids.
[0043] A compound preservative containing hawthorn leaf flavonoids extract, raw materials are:
[0044] Hawthorn leaf flavonoid extract 0.95 parts, carboxymethyl chitosan 19 parts, glycerin 36 parts, calcium chloride 7.8 parts, polyethylene glycol (molecul...
Embodiment 3
[0047] A hawthorn leaf flavone is characterized in that it is extracted by the following method:
[0048] (1) Mix the powder of hawthorn leaves with 70vol% ethanol solution according to the ratio of material to liquid: 1g: 20mL, then add acetic acid to adjust the pH value to 5, stir evenly, add to the ultrasonic extractor, and heat up to 50°C, under the condition of power of 500W, repeat the extraction three times, each time for 20min;
[0049](2) Combine the extracts and filter, and when the filtrate is extracted with ethyl acetate until it becomes nearly transparent, remove the ethyl acetate layer with a separatory funnel, concentrate in a rotary evaporator, and freeze-dry to obtain hawthorn leaf flavonoids.
[0050] A compound preservative containing hawthorn leaf flavonoids extract, raw materials are:
[0051] Hawthorn leaf flavonoid extract 1.5 parts, carboxymethyl chitosan 10 parts, glycerin 40 parts, calcium chloride 10 parts, polyethylene glycol (molecular weight 600)...
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